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Montmorency-Oscoda-Alpena Landfill (Atlanta, Montmorency County)

EGLE Site Lead: John Ozoga, OzogaJ@Michigan.gov or 231-429-1718. Content last updated April 7, 2022.

Background

The Montmorency-Oscoda-Alpena Landfill (Landfill) located at 6751 Landfill Road, consists of 86.06 acres and is a licensed municipal Type II landfill.  The landfill is owned and operated by the Montmorency-Oscoda-Alpena Solid Waste Management Authority (Authority).  It has operated since 1977 and is surrounded by State of Michigan forest land.  The Landfill primarily services a three-county area and has received domestic, commercial, and industrial solid wastes.  The Landfill was originally operated as an unlined site and later converted to a double liner system.  Due to on-site conditions, rainwater infiltrated into the unlined cells, which resulted in groundwater contamination.  The Authority initiated a Remedial Action Plan addressing the groundwater contamination on January11, 2000, that was approved by EGLE.  

Due to the groundwater conditions at the Landfill, and the likelihood that PFASs may also be present, EGLE requested the Authority conduct PFAS sampling.  The Authority sampled select monitoring wells at the Landfill during the fall of 2019. 

The Landfill is located in the center of large ridge (moraine). The groundwater flow leaving the Landfill is in two directions due to the ridge.  The groundwater flows to the northwest direction in the perched aquifer on the west side, and in a northeast direction in the regional aquifer on the east side of the Landfill.  Both aquifers discharge to the Thunder Bay River Watershed.  Groundwater depths to the aquifers vary from 60 to over 100 feet.  Groundwater contamination has been detected in both the perched and regional aquifers however, only the regional aquifer has detections of PFAS above Part 201 criteria.  The nearest residential wells are over a 1 ½ mile away to the northeast. The Thunder Bay River is located 2 ½ miles down gradient of the Landfill in a northeast direction. 

Montmorency-Oscoda-Alpena Landfill Map

Recent Accomplishments

  • On March 31, 2022, EGLE approved of a new Hydrogeological Monitoring Plan (HMP).  The HMP requires annual sampling of PFAS compounds in select wells. 
  • On January 4, 2022, the Authority sampled the Landfill Office production well for PFAS compounds.  The sampled results were non-detected for PFAS compounds.
  • On February 15, 2022, EGLE approved of a work plan to install a new monitoring well (M-203) down gradient of Landfill.

Next Steps

  • EGLE anticipates the sample results from the new monitoring well M-203 to be available by late summer.

Residential Well Testing/Alternate Water Information

  • EGLE is working with the local health department to determine if there are any residential wells that need sampling. Future sampling will be based on findings of Remedial Investigation.

Upcoming Community Engagement

  • None scheduled at this time.

Sampling Results Summary 

Type of Sample

Date Sampled (or Range)

Number of Sample Results Received

Number of Samples above Criteria*

Groundwater Monitoring Wells

September 2019 - January 2022 10 2
*Residential well and groundwater monitoring well results are compared to EGLE Part 201 criteria for 7 PFAS compounds effective 12/21/2020:  PFOS (16 ppt), PFOA (8 ppt), PFNA (6 ppt), PFHxS (51 ppt), PFHxA (400,000 ppt), PFBS (420 ppt), and HFPO-DA (370 ppt).

Sampling Notes

  • None at this time. 

Historical Timeline

    • On December 20, 2019, EGLE received the PFAS Groundwater Summary Report from the Authority.  Monitoring well M-401 on the east side of the Landfill had a detection for PFOA at 8.5 ppt, which is above the Part 201 Criteria. 
    • On January 30, 2020, EGLE received the 4th Quarter 2019 Hydrogeological Monitoring Report.  Contaminants detected in the groundwater were at historical levels.
    • On February 18, 2020, EGLE received the 2019 Remedial Action Plan Annual Report.  The annual report summarized Part 201 exceedances in the groundwater and addresses taking additional remedial investigative measures.
    • On April 20, 2020, EGLE approved of the Remedial Investigation Work Plan submitted by the Authority.  The work plan addresses evaluating groundwater impacts at the Landfill and proposes additional remedial measures by installing new monitoring wells and additional PFAS sampling.
    • In September 2020, additional sampling of monitoring wells M-401, M-606, and M-607 was conducted. New sentinel monitoring wells M-606 and M-607 were installed during the summer of 2020.
    • On November 13, 2020, EGLE received the PFAS Groundwater Sampling Report (Report) of monitoring wells M-401, M-606, and M-607 that were sampled by the Authority during September 2020.Sample results in the Report indicated that new monitoring wells M-606 and M-607 had no detections above the PFAS criteria and monitoring well M-401 detected PFOA at 21 ppt above the PFAS criteria of 8 ppt.
    • On December 4, 2020, EGLE received the Monitoring Well Installation Report for M-606 and M-607.